New Delhi: There is no proposal to set up special courts for trial of rape cases, but states are being impressed upon to probe such crimes more efficiently by deputing best officers, Home Minister P Chidambaram said on Wednesday.

"At present, there is no proposal under consideration," he said in the Rajya Sabha during Question Hour when asked if the government proposes to set up special courts to ensure speedy trials and expeditious relief and rehabilitation of rape victims and victims of injuries like burns and acid attacks.

He said though police is a state subject, the Centre was "impressing" upon states to depute best officers to probe such cases.

Admitting that there were delays in medical and forensic examination in some cases, Chidamabaram expressed hope that police probed cases of crime against women seriously.

To a query on declining rate of conviction in rape cases, he said it depends on nature of evidence and efficiency of prosecution besides other factors.

As 'police' and 'public order' are state subjects, the primary responsibility of prevention, detection, registration, investigation and prosecution of crimes, including crimes against women was with the state governments and Union Territory administrations, he said.

"However, the Union Government attaches the highest importance to the matter of prevention and control of crime against women," Chidambaram said.

He informed the House that Ministry of Home Affairs had sent a detailed advisory in September 2009 on crimes against women to all state governments and UTs, asking them to adopt appropriate measures for swift and salutary punishment to those found guilty and set up fast track courts and family courts.